Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: question: Nomeie a extensão para a universidade de Washington
 ###Tabelas: CREATE TABLE d_&_r (d_&_r_id AUTO_INCREMENT PRIMARY KEY, Serial & Branch INT, Seaman VARCHAR, Mechanical VARCHAR, Secretariat VARCHAR, Supply VARCHAR, Electrical VARCHAR, Radio Electrical VARCHAR, Regulating VARCHAR, Medical VARCHAR) CREATE TABLE area_and_population (area_and_population_id AUTO_INCREMENT PRIMARY KEY, Member State VARCHAR, Population in millions VARCHAR, Population % of EU VARCHAR, Area km 2 INT, Area % of EU VARCHAR, Pop. density People/km 2 VARCHAR) CREATE TABLE percentage_starts_from_front_row (percentage_starts_from_front_row_id AUTO_INCREMENT PRIMARY KEY, Driver VARCHAR, Front row starts INT, Pole positions INT, Entries INT, Percentage VARCHAR) CREATE TABLE stations_under_construction (stations_under_construction_id AUTO_INCREMENT PRIMARY KEY, Station VARCHAR, Extension VARCHAR, City/Neighborhood VARCHAR, Projected opening INT, Transit Connections VARCHAR, Park and ride? VARCHAR) CREATE TABLE semi-final_1 (semi-final_1_id AUTO_INCREMENT PRIMARY KEY, Draw INT, Artist VARCHAR, Song VARCHAR, Points INT, Place INT)  
SELECT Extension FROM stations_under_construction WHERE City/Neighborhood = University of Washington